title: Identification of a lysine residue at a nucleotide binding site in the firefly luciferase with p-fluorosulfonyl[14C]benzoyl-5'-adenosine.
abstract: Firefly luciferase is 80-90% inactivated within 3 h upon incubation with the adenine nucleotide analogue p-fluorosulfonylbenzoyl-5'-adenosine (FSBA). Although 4 mol of 14C-FSBA/mol of enzyme is irreversibly bound during inactivation, only 1 mol of 14C-FSBA appears to be specifically directed to an adenine nucleotide binding site on the enzyme. The other 3 mol of 14C-FSBA is bound to the protein nonspecifically. The major radioactive peptide in a tryptic digest os labeled luciferase was isolated and shown to have the following amino acid sequence: *Lys-Gly-Glx-Asx-Ser-Lys, where *Lys is the radioactive derivative of the lysine residue that was sulfonylated during the inactivation.
mesh_terms: D000241:Adenosine / Q000031:analogs & derivatives* / Q000494:pharmacology; D000345:Affinity Labels / Q000494:pharmacology; D000595:Amino Acid Sequence; D000596:Amino Acids / Q000032:analysis; D000818:Animals; D001665:Binding Sites; D001517:Coleoptera / Q000201:enzymology*; D007700:Kinetics; D008156:Luciferases / Q000378:metabolism*; D008239:Lysine / Q000032:analysis*; D010446:Peptide Fragments / Q000032:analysis; D011485:Protein Binding; D014357:Trypsin
chemical_list: D000345:Affinity Labels; D000596:Amino Acids; D010446:Peptide Fragments; C010959:5'-(4-fluorosulfonylbenzoyl)adenosine; D008156:Luciferases; D014357:Trypsin; D008239:Lysine; D000241:Adenosine